An NRA attendee tests a Colt gun during the 2013 National Rifle Association (NRA) Annual Meetings & Exhibits at the George R. Brown Convention Center in Houston, Texas, U.S., on Saturday, May 4, 2013. Demonstrators who have lost loved added an emotional edge to what is otherwise a pep rally for 70,000 NRA members and hundreds of firearms and sporting-goods vendors. Photographer: Aaron M. Sprecher/Bloomberg